1. collected, gathered -- (brought together in one place; "the collected works of Milton"; "the gathered folds of the skirt")
2. collected, equanimous, poised, self-collected, self-contained, self-possessed -- (in full control of your faculties; "the witness remained collected throughout the cross-examination"; "perfectly poised and sure of himself"; "more self-contained and more dependable than many of the early frontiersmen"; "strong and self-possessed in the face of trouble")

1.

He became very cool and collected all at once. - from Heart of Darkness by Joseph Conrad

2.

I collected it myself at a very great personal risk. - from Heart of Darkness by Joseph Conrad

3.

A group of idle gazers was collected to watch the arrival. - from The Best American Humorous Short Stories by Various